Website design keeps changing and breaking

Every few weeks my site keeps changing in ways where the design changes and breaks, this is very unfair! I have to keep affording support to keep it looking normal and re-doing the backend with a programmer? I’m very frustrated… this has happened a lot and I’m tired of it happening for no reason

www.joelrea.com.au/pages/paintings - design should be 3 images across, but now 1 column

Same as my STORE page

On the STUDIO page the instagram plugging just disappeared for no reason

If you need to find the problem and fix it, you can contact me and I can help you with your website building problems!