Today marks 21 days since my return was accepted and now it doesn't show any bars when tracking and states it is still processing. Should I call or wait a few more days?

Originally the "Where is my refund" tool on the IRS website showed bars reflecting the progress of my refund.  It then showed it could not find my information for a day, then went back to showing bars, and then yesterday it does not show any bars or that it might take 21 days but states it is still processing and they will let me know once it is approved.  I did have to claim my stimulus on my refund as I did not receive either last year.  I'm not sure if this is causing the delay, but as of today it has been 21 days.  I'm not sure if this is a common issue happening and if I should wait a few more days or maybe a week or if I should try calling.