Clock bug when leave/return

[Clemenard]

My opponent left the game for a few seconds with clocks at something like 10min vs 8min. Then, when it came back it became 5 absolute periods of 30s on my visual. It was just fine on his side. When i quit / relog, the real time returned. Since he was fairplay enough to cancel my missclick due to time stress, there is no complain about the result

Here is the sgf file :

(;GM[1]FF[4]CA[UTF-8]AP[WebGoBoard:0.10.9]ST[2]RU[japanese]SZ[19]KM[0.5]HA[0]TM[25:00 + 00:30(5) ByoYomi]RE[B+Resign]DT[2019-07-03]PB[Whithak]BR[4k]PW[PsychGo]WR[3k]EV[Ranked game]PC[The KGS Go Server at http://www.gokgs.com/]C[PsychGo [3k]: hi
Whithak [4k]: Have a good game
];B[pc];W[dp];B[qq];W[dd];B[np];W[qe];B[qg];W[od];B[oc];W[nd];B[mc];W[kq];B[md];W[of];B[qj];W[qo];B[qm];W[pq];B[qp];W[pp];B[po];W[oo];B[pn];W[op];B[mf];W[qh];B[og];W[pg];B[ph];W[pf];B[oh];W[rg];B[fc];W[cf];B[cn];W[cl];B[cq];W[dq];B[cp];W[do];B[co];W[em];B[hd];W[kn];B[fe];W[qi];B[pj];W[nf];B[mg];W[qc];B[ch];W[ef];B[cj];W[ek];B[bl];W[bk];B[ck];W[bm];B[dl];W[cm];B[dm];W[dn];B[bn];W[al];B[dk];W[bj];B[bi];W[aj];B[el];W[fm];B[fl];W[gm];B[gl];W[hm];B[cc];W[dc];B[db];W[cd];B[bc];W[bg];B[bh];W[be];B[ec];W[ik];B[gg];W[fh];B[fg];W[eg];B[gh];W[gi];B[fi];W[eh];B[hi];W[gj];B[hj];W[hk];B[gk];W[fj];B[ej];W[ei];B[fk];W[di];B[fi];W[ci];B[qb];W[rb];B[pb];W[qd];B[on];W[nn];B[nm];W[mn];B[pr];W[or];B[qr];W[nq];B[dr];W[er];B[cr];W[fq];B[jj];W[ng];B[mh];W[ki];B[kj];W[li];B[lj];W[mi];B[nh];W[mj];B[ll];W[ml];B[mm];W[lk];B[kl];W[kk];B[jk];W[mk];B[ij];W[nc];B[nb]C[Whithak [4k]: time bug?
];W[lm];B[jl];W[om];B[nl];W[ol];B[nk];W[ok]C[Whithak [4k]: oh, it works again
Whithak [4k]: thx buddy
Whithak [4k]: thx, ill try to logout
Whithak [4k]: oh, it works again
Whithak [4k]: thx buddy
](;B[ni];W[nj]C[Whithak [4k]: missclick-_-
Whithak [4k]: 13 seconds for a full game...
Whithak [4k]: i'll report it. void game?
PsychGo [3k]: what do you mean?
Whithak [4k]: you leaver then return the game. then, my ckock mecame 2min absolute
Whithak [4k]: no byo yomi, and i was left with 13 seconds
PsychGo [3k]: no
Whithak [4k]: you didn't had that visual?
PsychGo [3k]: there's byo yomi
])(;B[nj];W[oj];B[ni];W[pi];B[oi];W[ql];B[pl];W[qn];B[pm];W[rm];B[pk];W[rp];B[rq];W[ro];B[rl];W[sn];B[sp];W[sr];B[sq]))