Reflux?

We’re currently in the process of switching from expressed breast milk to formula. Baby has always had one formula bottle a day (kendamil) so the formula itself isn’t new but now all but one of her bottles are formula She used to have a bit of reflux after a feed but it gradually went away, recently however it feels like she is sick/spitting up constantly This isn’t just after a feed it can be any time, for example she fed over an hour ago and now has just spit up 6 times in 10 minutes She’s fine in herself and still putting on weight. Is this actually reflux or something else?