Hi MGS_No406TaLk - welcome to the forums,
Thank you for describing your original island lay our in detail as well as your experiences there and on other islands. The team are aware of the issue with the red containers (we have a Known Issues report about it here: [Known Issue] - Multiple doors and sides on containers ) but they normally are mentioned in lag when used as construction material. I shall pass the details of your experience of the whole containers onto the team.
Please also note that the same issue that causes containers to multiply can also cause plants to duplicate too, so if you have a large number of planters on your island the lag there might build up too - This isn’t confirmed as it hasn’t been reported except for when players harvest a lot from the plants.
Thank you again