Multibar texture is rotating or something when using textures see picture.

Should look like this:

Is this a bug or something?

Bar Textures are stretched, not tiled and there is no configuration option to change this behaviour.

Ah okay, but it only happens when I use multibar.

Try out 2.2.6-beta version.
I added some texture options for multibars to enable texture tiling and adjust the texture to maintain the aspect ratio.
Depending of the texture you are using, maybe enabling the "Horizontal Tiles" option you can get the desired behavior for the texture.
I changed the multibar settings appearance too, now each bar has its own Tab, This new interface should be more clear (i hope).

that was so much better, and works like a charm!
(and so pretty with each bar has a tab!)