strange backspace behaviour

Hi,

Using vim 7.4 with patches up to 712 included.

For some time now, I witness a strange behaviour when hitting the
backspace key. For example:

s<backspace>s gives ß
p<backspace>p gives ¶
a<backspace>a gives å
0<backspace>0 gives ∞

but

w<backspace>w gives w as expected. I've tried most of the 26 letters
and some do show this behaviour others don't (I can provide the full
list if necessary). It's not linked to the time between the two keys
because

s <wait 5 seconds><backspace>s or s<backspace><wait 5 secondes>s

gives ß.

I don't recall having tweaked vim lately and last time I compiled vim
was April 30 2015. So I'm currently a bit lost and don't know how to
troubleshoot this issue (which is very annoying when writing an
email).

Any ideas of what's happening?

Thanks a lot,
Steve

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