US electrical q:my 240v reads only 190v

Was fixing a bad wiring job between a sub panel and a 240v 2 phase water pump and noticed that my multimedia was only testing it as 190v. Checked back at the breaker and saw the same. Checked between L1 and L2 on a different breaker and saw the same.

My 240v equipment (dryer, oven, water heater, 2 HVAC units) all work fine.

Should I be concerned?

How big of a deal is this? Like call an electrician asap or wait until I have some other electrical work lined up?