Where is this non-multiple of 5 XP coming from?
The non-multiple of 5 XP reward comes from training at a gym. Link to answered question: How much xp/prestige do you gain at a gym by training?
Training in your own team gyms
The non-multiple of 5 XP reward comes from training at a gym. Link to answered question: How much xp/prestige do you gain at a gym by training?
Training in your own team gyms