Is this gap between the aligner and tooth normal? (Photo)

With Invisalign there are cases of stubborn teeth that do not always move in the timely manner we would like them to. Give it more time and you may find your tooth moves with the tray, if not consult with your treating dentist and ask if you will need a refinement (a new set of trays formatted to the current position of your teeth).
Good luck!

When Aligners are inserted they should fit intimately without any gaps.  However, sometimes gaps appear and upon wearing the aligners the gaps disappear. Chewing on a cotton roll or chewies can help seat the aligner fully. Your dentist will determine if the gaps are acceptable or not. If too many aligners go by and the gaps don't disappear  then a refinement is needed and new impressions need to be taken.  Hope this helps.  Good Luck!

 No, the aligner should fit up against your tooth without any space just as it  fits against your other teeth. If it does not fit properly, this could cause tracking issues and delay in results.  Did the previous aligner  fit properly?  It may be possible to get to fit properly by using chewies to help seat the aligner over that tooth better. You should contact your dentist and advise him of the fit issue, and get it resolved before you move onto the next aligner.