Thank you for your assistance.
The pages that the “Position” column disappears are the following:
1)event recaps
for example: https://www.taiwanhockey.com/cthl/event/cthl15-27/
2)team player lists
The default player list that is selectable from the edit page does show the “position column” but since that list is displayed at the bottom of the page when I view it, I used shortcodes to insert the player lists on the page manually so they appear at the top of the page which is where I want them to be placed. But then the “Position” column disappears. I have left both player lists on the following page below. One is at the top and the default list is at the bottom.
https://www.taiwanhockey.com/cthl/team/taipei-mustangs/
For the 1) event recaps, the problem comes from setting columns to manual.
For the 2) team player lists, I have not been able to find the cause of why the “Position” column disappears when I insert using shortcodes. And I have not been able to move the default player list from the bottom to the top of the page. I have tried to insert the custom CSS recommended in other posts on this forum but unfortunately it did not work.
Thanks again.