Incorrect altitude when planning a route

[Yaqana]

Description

I'm planning an ascent up a 955m hill along an existing path using walking profile. The altitude widget correctly detects this is the height, but the route profile shows maximum altitude at about 600m. Thus, the "uphill" value is around 30% smaller than it should be.

I have similar problem with the same path further towards another hill. I planned a lot of routes in nearby area and the elevations look reasonable on them, definitely not 30% off.

Steps to reproduce

Plan a walking route from Corryhully bothy (‎56.90381° N, 5.42896° W‎) to Sgùrr nan Coireachan top (‎56.93572° N, 5.44855° W‎)

Actual result

The altitude range is 65m-611m. The uphill value is 563m.

Expected result

The route profile should go up to 955m at the end, the altitude range should be more like 65m-955m and the uphill value at least 890m

Your Environment (required)

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OsmAnd Version: 4.8.4.1
Android/iOS version: iOS 18.1.1
Device model: iPhone 13 Pro
Crash-Logs: ?