Facebook Ads Device Targeting Bug

I’m promoting a offer that is desktop only on Facebook ads and set “desktop” only option. My ads been running and noticed a very poor performance, turns out that I found out that 100% of the clicks were coming from mobile devices. I’m pretty sure it’s a glitch on Facebook because I was targeting mobile on the past on the same ad and switched to desktop only. Anybody ever experienced this ? I contacted Facebook support and asked them what’s up and also for a refund. I suggest you guys also to check that in case running desktop only. And yes, I tripled checked the settings.