Have you tried clicking on the >> sign? That will direct you directly to the last post of a topic.
There IS a difference though -
On the Forum "Topic List" page -
On my Windows PC under Chrome or Opera I get some page numbers to click on including the last one as in e.g "2 3 4 ... 22 23"
On my Android tablet under Chrome or Opera I get the same "clickable" page numbers
On my Android phone under Chrome I just get an unaddressable page icon and an unaddressable last page number - so the only way of getting to the last page is indeed to scroll right and "click" ">> >>". This is the situation Zoe has identified and it has only emerged since the last upgrade
It is no big deal, just an "interesting" variation - whether due to Android or Chrome or the way the script has been set up I know not (I only have 1 browser on my Android phone)!