There's more to the wiper system than what you see from the front. You need to open the hood and check the arms from the wiper motors to the two wiper posts for problems.
In addition, all wiper motors have a "park" circuit that continues to supply power to the wiper motor when you turn the wiper off, until the wipers reach the park position, then a switch opens interrupting power to the motor. Your wildly swing wiper arms may have caused that switch to stick closed ot you may a wiper motor assembly going bad. You may also have a bad switch on the wiper control stalk.
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad