The gods of Krita, please help me with a little mystery?

I've been drawing a small thing in Krita on my LCD graphic tablet (it didn't turn out well, as you can see). Then I exported the file in PNG and opened in GIMP. The colours were clearly off.

I thought maybe it was an RGB profile, so I re-exported the image from Krita in sRGB. Krita crashed on export, and when I reloaded the file from autosave, the colours in the kra file were exactly as on the PNGs that I've exported (both in default profile and sRGB).

My best guess is that I've been drawing in the palette that I got in the exported PNGs, but __something__ made things look like the palette was different. What could it have been?

Side note:

In the panic I did not save the file rescued by the auto-save. I started from a PNG reference and forgot to re-save it as a Krita file. I kind of want Krita to behave like GIMP here: opening any format, but saving only in xcf/kra to preserve the layers. %)