I cannot reproduce with Firefox for Android using my phone (I don't have any tablets).
Does this happen on all long strip titles? What about paged titles set to long strip in readers settings?
What version of Firefox are you using? What device and OS version?
Your device might be running out of ram or something similar (where it temporarely stocks images and such) for a single tab.
Try to use a different browser first to see if the problem is unique to firefox. If it is, try clearing up the cache