Retainer noit gaining experience

[Futility]

I'd like to confirm the bug on the PC, as well. Might be class or equipment dependent.

Yesterday I have sent one retainer on a Fishing Exploration. Retainer was equipped with a weathered fishing rod and a Helm of Light. Upon return, I have received some items and retainer gained enough EXP to reach level 5.

My second retainer who, I chose to be GLA, was also sent onto an Exploration Venture. He was equipped with a weathered sword and a Moogle Cap. Upon his return I have received some items but retainer has not gained any EXP and stayed level 1.

Both retainers are showing completed ventures in their corresponding logs.

Additional info: My FSH is level 50. GLA is level 3. Do I have to level up GLA in order for Retainer to gain EXP?