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Your phone is running the Android OS which uses the ext4 file system (a common Unix-based file system), your Windows PC is running, well Windows, and uses NTFS as its file system (a Windows only file system) -- two different operating systems and two different file systems. There's also an issue where your phone's internal storage is ext4 while a microSD card formatted as external (portable) will be FAT32 (or exFAT for larger capacity cards). So your Win10 PC only has very limited ability to view/access your phone's internal storage media, while still having a lot more access to the microSD card. It's all just a compatibility issue.
My thanks to everyone who replied. I finally solved the problem by carrying out a factory reset