[bojan]

I had the same problem with binos I bought on Sunday market couple of years back.
The method to sort the problem is very simple, I used it specifically for that purpose.

Draw a pair of circles on a piece of paper, the distance between the centres should be the same as the distance between the centres of eyepieces. This will be you template for collimation.

On a sunny day, project he Sun's images on that paper. Those images (bright circles) should fall exactly on tour drawn circles on a paper (in your case they will not, of course). watch for the shadow of the binos as this will help you to orient the template correctly in up-down direction.
The best would be if you can mount your binos on a tripod or some other fixture while doing this.

Now, the objective lenses are mounted inside two eccentric rings (one inside another), and those can be rotated individually (two notches are provided for this. Please note, those notches are accessible after you remove the top cover rings from objective by un-screwing it).
By adjusting those eccentric rings, you can center each lens such that previously mentioned Sun's images are aligned with drawing.
If you can not do it by means of adjusting objectives (or if your binos do not have those rings), then it is time to fiddle with prisms.
Your binos will be correctly colimated when the Sun's images centres are aligned with the template.

Most likely your binos were knocked.
Sometimes very slight hit will move the prisms out of alignment.
Very often this alignment was not done properly at the factory....