I reviewed the setting the kick off for the match is 12:35pm my time users can enter predictions up to the 60 seconds before kick off. I ran the Timezone Debug Info script and it shows that match lock is true and match will be locked at 12:34pm.
Match: (79) Australia – Argentina
Match date (database, should be UTC): 2018-05-14 16:35:00
Match date (local): 2018-05-14 12:35
Match timestamp (database, should be UTC): 1526315700
Match is locked: true
Match was/will be locked at time (local): 2018-05-14 12:34
WordPress timezone offset: -4
WordPress timezone string: America/La_Paz
WordPress current date (local): 2018-05-14 12:59:52
WordPress current timestamp (local): 1526302792
WordPress current date (UTC): 2018-05-14 16:59:52
WordPress current timestamp (UTC): 1526317192
Plugin prediction stop method matches: 0
Plugin dynamic stop threshold (in seconds) for matches: 60
Plugin prediction stop date for matches:
Plugin prediction stop method questions: 0
Plugin match time display setting: 0
PHP current date and time (UTC): 2018-05-14 16:59
PHP current timestamp (UTC, time()): 1526317192
PHP current timestamp (UTC, date->format(“U”)): 1526317192
PHP default timezone setting: UTC
MySQL current date and time (UTC): 2018-05-14 16:59:52
MySQL current timestamp (UTC): 1526317192
MySQL current date and time (local): 2018-05-14 11:59:52
MySQL global timezone setting: SYSTEM
MySQL session timezone setting: SYSTEM