mobile fonts wrong only in 2nd and 3rd columns

Hi, we dont’ have any custom css being applied to tables anywhere on the site, but on mobile, tablepress tables have a different font in 2nd and 3rd columns only (sometimes only the 3rd column). if i put the following css in the tablepress options custom css, it affects only the affected columns (2nd and 3rd or sometimes just 3rd). i can’t seem to control the whole table. please advise, thank you!

@media only screen and (max-width: 768px) {

thead th,
tbody td {
font-size: 18px!important;
}

}

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