Will this affect my tank in the long run? A bit uneven..

[kanesaquatics]

I just set this tank up. Just noticed the water level is not even. Should I be worried. Tank has a leveling mat underneath. Not really doing its job as you can see.

 

[Timfish]

As long as the tank is evenly supported on the stand it shouldn't be an issue if the stand is slightly shorter on one side or if the floor is out of level. But if you hanven't added any animals yet you might consder emptying it and leveling the stand.