can't deploy new workers when I haven't reached limit

as you can see in the screenshot, I only have 1/5 total workers deployed. but I'm seeing this "Upgrade Total Workers" dialog that preventing me from add new workers. I previously has reached the limit of 5, but then I deleted lots of workers, so I'm now down to 1 and hoping to add new workers. But cannot add.

Solution:

oh it suddenly recovered now...

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