Steps to reproduce:

1) Find some multiselect input field, e.g., in latest data there is a host group filter;
2) Add one or more options;
3) Put cursor in the field in the place where placeholder text 'type here to search' is located and delete all previously added options using 'backspace' button on your keyboard;
4) Now, try to press 'Select' button and pick some new options.

Result: options are not added. Sometimes it also adds only part of selected options if at the 4th step I have selected multiple options.