Need an advice

Hi guys, Got selected for react role in service based company. The hr said he will be rolling out the offer

Already have an offer Capgemini 8lpa Another offer from startup 7.8lpa Photon maximum 8lpa they can give

if I don't join photon after accepting offer letter they said to pay 10% of offered CTC. Is it normal? also said me to forward the Capgemini and startup company offer letter to them. Current role in tcs: process associate and designation is bpo2. Offered roles are developer.