Not importing organic groups correctly neither many values

I'm trying to import some users but it is not working with OG. See my file example below:

Example 1:

mail,name,pass,field_nome,roles,groups
user23@trocaremail.com,23_user,Qpt1724,My User,student,1st grade|high school

mail,name,pass,field_nome,roles,groups
user23@trocaremail.com,23_user,Qpt1724,My User,student,high school | first grade

Result: user subscribed to "high school" group only

Example 2:

mail,name,pass,field_nome,roles,groups
user23@trocaremail.com,23_user,Qpt1724,My User,student,first grade

Result: user subscribed to "high school" group only. (yes, "high school" - this group it has the lowest node id)

Neither working with id instead of title.

The "1st grade" group is not imported because the uif_plus_get_og_group function:

Line 598 (og version 1) and 609 (og version 2):

$column = (intval($group) > 0) ? 'g.gid' : 'g.label';

The return of intval is "1" for strings that contains numbers in the beggining, resulting in a attempt to retrieve 'gid' using the og title.

Modules version:

Organic Groups - 7.x-1.5
UIF - 7.x-1.4
UIF Plus - 7.x-1.2