WRT19000ACS signal strength moving between 0 and 100%

Hello all, I have a WRT1900ACS router with 18.06 of the firmware installed. The router is setup to client mode on another access point. I have been noticing that the signal strength the WRT1900 is reporting to the access point fluctuates between 0 and 100%. Is this normal? Is there anything that I can do to keep the signal strength at 100%. So far, I haven't noticed anything in terms of internet speeds. But I believe it is interfering with TravelMate. Also, the router is about 20 feet from the access point with no obstructions and is connected via the 5 GHz band.