Stape Gateway on Shopify affecting sessions in GA4

Ever since I implemented Stape Gateway on the acerstore.cl site, the total sessions that GA4 is measuring have been cut in half. If I compare the sessions that Shopify gave me before the implementation with GA4, they were very similar, but after implementing it, GA4 gives me half the sessions that Shopify does. What could be the reason for this? Could something be misconfigured?

@Cristian_de_la_Maza Since the gateway is a completely automated system where the person only has to enter their credentials, I can tell you that this is unlikely to be the problem.