Problem with cura 3.5

[Maikas 0]

stl file is perfect, but software is doing strange things. How to fix it?

[gr5 2,210]

Cura normally won't print walls/paths thinner than 0.8mm but you have a few choices.  You can check "print thin walls".  This will cause variable extrusion rates in this area which will be a slightly worse quality.  You can also lower the line width to < half the thickness of this area that you want it to print.  Or you can switch to a smaller nozzle.  Or you can enlarge the part.

[Maikas 0]

i found the solution, this new cura update changed my wall count from 3 to 6. Wasted all my day on this ?