Problem
The number of items shown in the floating action bar does not match what you believe you selected.
Possible cause
The action bar shows the count of individually selected items. If you used the select-all checkbox, it selects all items in the current view — you may see more selected than expected.
Solution
Click the select-all checkbox in the action bar to deselect all items.
Manually click the specific items you want to work with.
Check the count in the action bar — it should now match.
If the problem persists, contact support and include details about:
How many items you expected to have selected.
What the action bar shows.
When the issue occurred.