Most presumably, you have a cache plugin, which is causing this issue.
Please make a DB backup for your safety (you can use UpdraftPlus). Then, clear all the caches and check whether the issue persists or not.
Make sure the cache is excluded on the page where the given survey is enabled. After clearing the caches, please try to check the case with either the Incognito mode or another browser/device.
For changing the button text, we have the following feature available.
As you are using the Pro version of the plugin, please contact us via this form for premium support and further investigation of your case. Our customer care specialists will check out your case and help you as soon as possible.
As said previously, you are using the Pro version of the plugin, so please contact us via this form for premium support and further investigation of your case. Our customer care specialists will check out your case and help you as soon as possible.