Correct slider operation

Hello. In the slider when viewing ads is a failure. When viewing photos – when you click on the next, the ribbon of photos returns to the first. Viewing photos works asynchronously – it is not possible to view all the photos in a row, at a certain moment there is a return to the first photo.

I do not want to advertise my site, but if necessary I can provide a link to the ad that the user posted today and this problem is observed there.

How to fix this problem? Tell me please. Thank.