Ondřej Pražák wrote:

When a hostgroup name is too long, it is not contained within its table cell but 'spills' to other columns. Other pages may be affected as well.

elipsizing is one thing, but the other three columns (Hosts, Hosts including Sub-groups, Actions) occupy unnecessary space. It looks like the four columns occupy equal width even though only the first one is truly variable length (the host count columns are technically variable length, but realistically going to be within 4-5 digits).