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.