My gmail labels are reorganizing themselves [Closed]

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Hello,

I try to organize my emails using labels, but I have problems.

Among other things, I have labels that go back to their previous position. If I put them in a label, they come back to the root.

All this seems random, even if it probably isn't.

Notice that I installed plugins, tried to use two other addresses from my main gmail address (one msn and one gmail) and configured desktop email clients.
I deleted all that, but it may have left some traces.

Thank you.

System Configuration: Windows / Opera Next 62.0.3331.116