diff --git a/frontend/src/i18n/en.ts b/frontend/src/i18n/en.ts
index 5afb9e16..9fd0279c 100644
--- a/frontend/src/i18n/en.ts
+++ b/frontend/src/i18n/en.ts
@@ -1098,6 +1098,7 @@ const en: Translations = {
     langEn: 'English',
     currency: 'Currency',
     currencyHint: 'Display currency. Data is stored in UAH; converted at NBU rate.',
+    currencyDisabledTooltip: 'Currency conversion is under repair and will be available shortly',
     currencyUah: 'Hryvnia (UAH)',
     currencyUsd: 'US Dollar (USD)',
     currencyEur: 'Euro (EUR)',
diff --git a/frontend/src/i18n/uk.ts b/frontend/src/i18n/uk.ts
index 7271d77d..bc3f929d 100644
--- a/frontend/src/i18n/uk.ts
+++ b/frontend/src/i18n/uk.ts
@@ -1095,6 +1095,7 @@ const uk = {
     langEn: 'English',
     currency: 'Валюта',
     currencyHint: 'Валюта відображення. Дані в базі зберігаються в UAH; конвертація за курсом НБУ.',
+    currencyDisabledTooltip: 'Валютна конвертація в розробці, буде доступна найближчим часом',
     currencyUah: 'Гривня (UAH)',
     currencyUsd: 'Долар США (USD)',
     currencyEur: 'Євро (EUR)',
diff --git a/frontend/src/pages/Profile/ProfilePage.tsx b/frontend/src/pages/Profile/ProfilePage.tsx
index e4638fb6..2195f08a 100644
--- a/frontend/src/pages/Profile/ProfilePage.tsx
+++ b/frontend/src/pages/Profile/ProfilePage.tsx
@@ -1,4 +1,4 @@
-import { Card, Descriptions, Button, Space, Tag, Select, message } from 'antd';
+import { Card, Descriptions, Button, Space, Tag, Select, Tooltip, message } from 'antd';
 import { GlobalOutlined } from '@ant-design/icons';
 import { useEffect } from 'react';
 import PageHeader from '../../components/PageHeader';
@@ -112,17 +112,20 @@ export default function ProfilePage() {
           </Descriptions.Item>
           <Descriptions.Item label={t.profile.currency}>
             <Space direction="vertical" size={4} style={{ width: '100%' }}>
-              <Select<SupportedCurrency>
-                value={preferredCurrency}
-                onChange={handleCurrencyChange}
-                style={{ width: 240 }}
-                options={[
-                  { value: 'UAH', label: t.profile.currencyUah },
-                  { value: 'USD', label: t.profile.currencyUsd },
-                  { value: 'EUR', label: t.profile.currencyEur },
-                ]}
-              />
-              <span style={{ color: '#8B949E', fontSize: 12 }}>{t.profile.currencyHint}</span>
+              <Tooltip title={t.profile.currencyDisabledTooltip} placement="top">
+                <Select<SupportedCurrency>
+                  value={preferredCurrency}
+                  onChange={handleCurrencyChange}
+                  disabled
+                  style={{ width: 240 }}
+                  options={[
+                    { value: 'UAH', label: t.profile.currencyUah },
+                    { value: 'USD', label: t.profile.currencyUsd },
+                    { value: 'EUR', label: t.profile.currencyEur },
+                  ]}
+                />
+              </Tooltip>
+              <span style={{ color: '#8B949E', fontSize: 12 }}>{t.profile.currencyDisabledTooltip}</span>
             </Space>
           </Descriptions.Item>
         </Descriptions>
diff --git a/frontend/src/stores/currencyStore.ts b/frontend/src/stores/currencyStore.ts
index fddfafcd..b7cf5cb7 100644
--- a/frontend/src/stores/currencyStore.ts
+++ b/frontend/src/stores/currencyStore.ts
@@ -40,8 +40,14 @@ export const useCurrencyStore = create<CurrencyState>((set, get) => ({
       for (const r of rates as ExchangeRateDto[]) {
         if (r.code === 'USD' || r.code === 'EUR') next[r.code] = r.rateToUah;
       }
+      // HOTFIX (PR #628 follow-up): currency conversion is under repair — force UAH
+      // display for all users and reset any stale USD/EUR preference server-side so
+      // that numeric values are not mislabelled. See docs/ROADMAP.md "Currency".
+      if (prefs.preferredCurrency !== 'UAH') {
+        try { await updatePreferences('UAH'); } catch { /* ignore — will retry next login */ }
+      }
       set({
-        preferredCurrency: prefs.preferredCurrency,
+        preferredCurrency: 'UAH',
         rates: next,
         loaded: true,
         loading: false,
@@ -53,10 +59,13 @@ export const useCurrencyStore = create<CurrencyState>((set, get) => ({
   },
 
   setPreferredCurrency: async (c) => {
+    // HOTFIX: switcher is disabled in UI; always persist UAH.
+    const forced: SupportedCurrency = 'UAH';
     const prev = get().preferredCurrency;
-    set({ preferredCurrency: c });
+    set({ preferredCurrency: forced });
     try {
-      await updatePreferences(c);
+      await updatePreferences(forced);
+      void c;
     } catch (e) {
       set({ preferredCurrency: prev });
       throw e;