Hello Ahg_,
Based on your post it sounds like the Health app isn't tracking your steps as expected. You're also not receiving credit for the steps taken in your third-party app Is that right? We're happy to assist.
How often does this seem to occur? Have you tested the issue with multiple workouts?
Does the issue continue after restarting the iPhone?
Restart your iPhone
Are your apps and iPhone fully updated? If not, the articles below will help.
Keep us updated
Update your iPhone, iPad, or iPod touch
Update apps or use automatic downloads
Warm Regards.