Specific prices frequently not submitting

[cyanoxide]

As of right now our system uses specific prices as a way to charge different prices to different countries so that we can keep the prices attractive looking to customers. We've decided to add some extra currencies into the mix and I've found a weird little issue. Sometimes when we try to submit a new specific price it simply doesn't add it to the list. You have to try three of four times before it acknowledges it and adds it on. 

 

There are no errors or notifications of any kind when this happens it simply appears to reload the page when you click save & stay. I thought maybe for whatever reason the error box just wasn't being displayed but when I try the exact same process with an invalid date range I do get a warning box so I'm unsure how to proceed with resolving the issue. It's not really realistic to expect someone to just keep trying to submit the specific price until it works so I'm hoping you might have some answers or at least be able to point me in the right direction.

 

Grasping at straws I had a look at the php error log to see if there was anything in there that might shed some light but the only thing in there of relevance was this:

[08-Nov-2016 10:53:31 Europe/London] PHP Notice:  Undefined index: right_column_size in /var/www/webroot/ROOT/cache/smarty/compile/0f/8d/fc/0f8dfc58fb3f59a5f8b2b0482ee84061014c5999.file.product.tpl.php on line 1394
[08-Nov-2016 10:53:31 Europe/London] PHP Notice:  Trying to get property of non-object in /var/www/webroot/ROOT/cache/smarty/compile/0f/8d/fc/0f8dfc58fb3f59a5f8b2b0482ee84061014c5999.file.product.tpl.php on line 1394

Chances are this is only relevant for the actual product theme file but I figured I'd include it just in case that turns out to be incorrect.