filtering greater and lower than on version attributes includes other versions

Selecting/filtering issues by fix version e.g. (fixVersion >= "7.0.2.0.00" and fixVersion <= "7.0.2.0.06") doesn't work correctly.
Selection includes extra issues with versions, that don't fit in specified condition (7.1 and 7.0.5). I found out that these were created between time period of creation of 7.0.2.00 and 7.0.2.0.06.
There are following rows in jira.projectversion table (id; vname):
10400;7.0.2.0.00
10600;7.1
11201;7.0.5
11505;7.0.2.0.06
I assume that some of your internal database select is based on "id" column instead od "vname" column provided in original condition.