Drupal 8.x

Thank you in advance!

Hi, I have created a form of table that displays the scores of students. I am trying to save the node IDs of the scores that have changed. So, I used

#form['#scores']

to save it. However, when the ajax callback function is called, the data is reset after it is done.
Below is the code that I wrote.
I am wondering if there is any way to disable the ajax callback from resetting the form each time.

Help (I think?)! I've recently received some weird nastygrams on my website (https://ReadingMA.us) that I don't understand (I have a tech background, but not so much website admin), but they seem like attack attempts to me. Anybody know about this kind stuff?

I don't see a way to upload here, but I can point you to the emails I'm talking about:

Hi,

I have created a view that shows some webform submissions (a list of title, first name, last name). But when I want to use a filter (for ex showing only ladies) I'm getting issues. 
I'm in "Add filter criteria", I select the field I want to use to filter (for ex Name: Title). 

When I click the "Add and configure filter criteria" button, I see the spinning wheel for a couple of seconds and then nothing happens. I'm still on the "Add filter criteria" screen while I would expect to go to the configuration screen. 

I want to add pdf links(e.g - abc.com/sites/default/files/xyz.pdf ) to sitemap.xml but there is no such option to do so . Is there any way to add such specific links to sitemap