Bubbling but no foam

[BrewingChip]

My cider is long past its active fermentation, but I noticed that despite the airlock bubbling there was never any foam. Is that a problem if there's no foam, or is it just weird because it's a cider and I used apple juice for a cheaper option?

 

[brewing_clown]

Quite normal

 

[Silver79]

Not abnormal, but when I started making cider I thought the same thing.