Bird table has regulally 2 Robins sometimes 3

Being very new to this I have read that Robins are extremely territorial and that it is very unusual to see two feeding on the same table.

Although some bickering goes on I regularly see two feeding on the table happily at once and sometimes three. I seem to have an abundance of Robin and have seen 3/4 at one time in the garden

My blackbirds seem to have more of an issue with others of their own species

5 mins ago on same bird table was

1 blue tit

1 great tit

1 chaffinch

1 robin

all eating together

Is this unusual?