An update- I reached out to my hosting provider, Siteground, and they ran extensive diagnostics and came back to an issue in Forminator itself that’s causing the issue. This was their debug report:
0.000049 openat(AT_FDCWD, “/home/customer/www/airbornevolleyball.org/public_html/wp-admin/php_errorlog”, O_WRONLY|O_CREAT|O_APPEND, 0644) = 5
0.000062 write(5, “[26-Nov-2020 03:55:22 UTC] PHP Fatal error: Uncaught ArgumentCountError: Too few arguments to function Forminator_Stripe::generate_paymentIntent(), 2 passed in /home/customer/www/airbornevolleyball.org/public_html/wp-content/mu-plugins/forminator-submit-before-stripe.php on line 1194 and exactly 3 expected in /home/customer/www/airbornevolleyball.org/public_html/wp-content/plugins/forminator/library/fields/stripe.php:274\nStack trace:\n#0 /home/customer/www/airbornevolleyball.org/public_html/wp-content/mu-plugins/forminator-submit-before-stripe.php(1194): Forminator_Stripe->generate_paymentIntent(100, Array)\n#1 /home/customer/www/airbornevolleyball.org/public_html/wp-content/mu-plugins/forminator-submit-before-stripe.php(96): Forminator_Stripe_Override->update_paymentIntent_Override(”, 100, Array, Array, Array, 176)\n#2 /home/customer/www/airbornevolleyball.org/public_html/wp-includes/class-wp-hook.php(287): WPMUDEV_Forminator_Submit_Before_Stripe->update_payment_amount(”)\n#3 /home/customer/www/airbornevolleyball.org/public_html/wp-includes/class-wp-hoo in /home/customer/www/airbornevolleyball.org/public_html/wp-content/plugins/forminator/library/fields/stripe.php on line 274\n”, 1195) = 1195
They also said
In other words, the actual error is logged in the file ~/www/airbornevolleyball.org/public_html/wp-admin/php_errorlog and it appears to be an issue with part of the code of the plugin forminator. I tried to resolve this by switching to different PHP versions but the error remains.