Slider Height

I am currently using your i-max theme for my wordpress website (https://texaslabelprinters.com). I recently tried to make the height of the slider smaller (which currently only consists of one slide) from the default height of 420px to 320px. Since I’ve made the change to the height, the slider content (consisting of the title, details and button) disappears. There is also a gray background area directly below the image/slide. When I inspect the code with my browser, it looks like the slider content is being shifted down below the slider image but is not displayed (only the gray background is). Is there a way where I can edit either the theme php files, CSS files or the TemplatesNext plugin files to make this issue go away.

Also note that for some reason my website might load correctly sometimes. If the slider content appears when you initially load the page, just refresh it once or twice and then it should display the way that I’m describing (without the slider content and the gray background). Obviously the gray background should not be there and the slider content should be visible. Thank you in advance for any help you need and please email me if you have any questions.