Each application has its own algorithm for recording the number of steps taken each day. No method is 100% reliable and it's possible that you'll sometimes find a discrepancy between your application and Squadeasy. Nothing serious, it's still a game ;-) However, if the difference is too great (over 30%), don't hesitate to write to boogie@squadeasy.com so that it can be corrected.
It may also be due to an authorisation problem, so I suggest you follow these steps:
Profile > Settings > Connect a sports application > Tick the box (if it's already ticked, you can untick it and tick it again).
The application will then ask you to link a Google account, so remember to connect the same account as your Play Store account.
For iOS,
Settings > Health > Squadeasy > Activate all (if it's already ticked, you can untick it and tick it again).
This will reset the steps on the application :)