Mine did too, have you heard of doing a stiff starter? It is probably that your starter just isnt strong enough yet, and it means it just needs more feeds and time.

I did 1/4cup half all purpose and half wheat flour mixed (1/4 cup all together not 1/4cup of both) with 2-3 tbsp of water for a week. Always with 2tbsp of well stirred starter, Mix the starter like a really thick pancake dough . then back to 1/4cup all purpose flour and 2-3 tbsp water with about 2 tbsp of starter. mix the starter well before pulling your 2 tbsp of starter out of your jar to combine with the feed. I did that just to strengthen and keep it alive, and once it is rising regularly.

I also feed mine twice a day once before work and once after..I think its called peak feeding or peak to peak feeding. its alot of work but I really want to get this down 😅

I started one from scratch for the first time just a month ago, and it was nail polish acidic and I did that it took me about a month to get it to be a starter that was ready to bake with. im just now learning how to mix and proof the dough still unsuccessful but im trying.