UTF-16 BE BOM (Big Endian) encoding adds redundant characters when viewed in Hex Editor.

[liufeiyafly]

For instance, when pasting the Chinese character 中 or more in Notepad++ with UTF-8 encoding, convert the encoding of characters to UTF-16 BE BOM (Big Endian) and then viewing it in Hex Editor, additional characters appear after the character 中.
When there are redundant symbols, disabling the HEX viewing mode in the Hex Editor can even cause Notepad++ to crash abruptly.

The Hex Editor is version 0.9.12, while Notepad++ is version v8.6.

[ExE-Boss]

Also occurs with: UTF‑16 LE BOM (Little Endian)

[chcg]

From https://www.compart.com/en/unicode/U+4E2D:

UTF-8 Encoding: | 0xE4 0xB8 0xAD
UTF-16 Encoding: | 0x4E2D
UTF-32 Encoding: | 0x00004E2D

Random chars are added on toggling between Hex and normal Editor view.