Betor, Ancestor's Voice
If you got Betor and Rhox Faithmender on the field, and attack with both. The gui shows you got the 8 life you are supposed to get, but in the end of turn trigger, there will be only 4 counters put on a creature.
I couldn't replicate. Was there an effect like [[Vorinclex, Monstrous Raider]] that would half the counters?
Vorinclex, Monstrous Raider - (Gatherer) (Scryfall) (EDHREC)
{4}{G}{G} Legendary Creature — Phyrexian Praetor 6/6 Trample, haste If you would put one or more counters on a permanent or player, put twice that many of each of those kinds of counters on that permanent or player instead. If an opponent would put one or more counters on a permanent or player, they put half that many of each of those kinds of counters on that permanent or player instead, rounded down.
Also could not replicate in actual play
[[Rhox Faithmender]] [[Betor, Ancestor's Voice]]
Rhox Faithmender - (Gatherer) (Scryfall) (EDHREC)
{3}{W} Creature — Rhino Monk 1/5 Lifelink (Damage dealt by this creature also causes you to gain that much life.) If you would gain life, you gain twice that much life instead.
Betor, Ancestor's Voice - (Gatherer) (Scryfall) (EDHREC)
{2}{W}{B}{G} Legendary Creature — Spirit Dragon 3/5 Flying, lifelink At the beginning of your end step, put a number of +1/+1 counters on up to one other target creature you control equal to the amount of life you gained this turn. Return up to one target creature card with mana value less than or equal to the amount of life you lost this turn from your graveyard to the battlefield.
Sorry i can't remember anymore. I'll check it again.