Those colored dots represent color options. They show at most 6, but in this case there are seven. So they show +1 label which itself takes more space than one more dot would.

If you hide something under More..., make sure you are actually saving space (e.g. you are hiding 3+ elements) or simply show everything right away.

Wrong:

If N > 6 then show 6 and “+(N-6) more”

Right:

If N > 8 then show 6 and “+(N-6) more”

Nothing is more annoying than just one element not shown on the last page.