new starter hungrier, acts different than my other starters

so i've been baking maybe a couple months, and it all started with my first starter, and quickly moved to a second starter (which it turned out i didn't need to).  the second starter never rises more than 2x, but it's active and bubbly, i've made some bread with it, fed it twice a day (it's now in the fridge), and as long as i fed it twice a day, it seemed happy.  the mother is in the fridge, i made a starter from it that is now also in the fridge while i deal with the newest one.

i decided to try the breadtopia starter and see how/if it was different.  i'm allergic to wheat, so i figured i wouldn't use it till i had thrown half of it away every day for quite a while.  the starter roared to life ahead of schedule, but following their directions to feed it once a day, it would turn to separating liquid each day, so i started feeding it twice a day at 1/1/1, often with a little extra flour, usually white spelt but i'd throw in a little whole grain spelt once a day.  on day 2 and 3, it was doubling in size a while after feeding, and the overall structure was full of air and nice and sticky after it had time to digest.  it's between 72 and 77 where it lives in a glass bowl.  i only use filtered water with it.

but here's the thing.  even feeding it twice a day at 1/1/1 or better, at around 10 hours, it's separating into liquid and smells vinegary (which was a sign with my other starter it was hungry).  my two other starters never separated like this, to where the entire starter is thinner than pancake batter and seems like it's breaking into two different liquids.  i thought it was dead when it did this the first time, but after feeding, it developed many bubbles, got thicker and sticky, smelled like starter again and rose, although only to 1.5%.

does this mean anything or should i just carry on?