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Is the slider a plugin or comes as part of the Minamaze (Pro) theme?

yes. The slide is part of the pro theme. Pro has all the features similar to the lite version.

Then, because Minamaze (Pro) is a commercial theme by Think Up Themes and the problem is with the slider, you should post your question on their support area.

These forums only deal with issues concerning the free themes from the WordPress Theme Directory.
Forum volunteers are not given access to commercial products, so they would not know why your /custom/commercial theme or plugin is not working properly. The developers/vendors are responsible for supporting their custom/commercial product.
See https://codex.www.ads-software.com/Forum_Welcome#Commercial_Products

Thanks. I am not sure if the problem is just with the slider. Thanks again for your comment though.