I'm very new to photoshop and i've been working on a graphic design poster all day. All was going well until a recurring error kept happening to many of my layers. The colours keep being wrongly displayed. There is nothing I pressed to do this, but for some reason an imported picture of a purple butterfly keeps turning yellow, the text I made blue keeps displaying as red, and so on and so forth. Is this some sort of bug or is there something wrong with my photoshop? Please help me find a way to fix this, as a beginner this is sorta scary as this interface is so overwhelming.
It's difficult to judge without seeing the document; have you been using blending modes in your Layers?
Maybe make a copy of your document and experiment with the Layers, turning them on and off, moving the up and down to see what's causing the issue.
Maybe a screen shot of your Layers pallette may help us.
If there is an appication issue try resetting the Photoshop preferences to see if that helps – you can do that under the General tab in Photoshop preferences.
(When you create complex document, it's important to use non-destuctive methods and also save separate files, incrementally named (filename1a.psd, filename1b.psd and so on) so you can go back a step if there's a file corruption or something.)