Simple Ads question with google adsense

Hello support I would like to know if simple ads and google adsense work properly together?

I am not sure if it is adsense or simple ads but I do not get consistent output of the display ad from adsense. Mobile rarely is showing and ad. Desktop browser sometimes it is blank and sometimes there is an ad. I am using the same ad code on another site not using simple ads and google adsense is always showing ads never a blank. This happens on edge, chrome and IE so it is not a browser thing.

Any thoughts?