The cause of mould behind your furniture is almost certainly condensation. Moisture-laden air gets trapped behind your furniture and condenses on the relatively cold surface behind which if not wiped away will cause mould. The colder the surface behind the furniture e.g. an external wall, the more likely it is that the problem will occur.
The article below provides lots of information on how to prevent condensation in your home but in terms of mould behind furniture, moving your furniture away from walls will have a big impact on airflow.
Further Reading
What is causing damp in my house? {Jungle Property Knowledgebase article}
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