scoreboard problem?

I made a feature that gives you 1 heart for every 25 creepers you k!ll but however this feature stopped working at 75 creepers locking the healthbar to be 26 hp in total that is [13 hearts] 
execute at @a[scores={creeperKills=75..}] run attribute @p minecraft:max_health base set 26
execute at @a[scores={creeperKills=100..}] run attribute @p minecraft:max_health base set 28
Upon k!lling 100 creepers they player must have 28 hp [14 hearts] in total but it does not boost
I also made a similar feature which boosts your attack speed by 0.1 for every 20 spiders you k!ll, 
execute at @a[scores={spiderKills=60..}] run attribute @p minecraft:attack_speed base set 4.3
execute at @a[scores={spiderKills=80..}] run attribute @p minecraft:attack_speed base set 4.4
same with this feature, upon k!lling 80 spiders the player must have their attack speed of 4.4, but it does not change. i checked the command and it was right but it still isnt working