US war time Nickels and US Half Dollars 1965 - 1970

I noticed a peculiar thing that happened to my collection in Numista

Those coins no longer count as silver coins, granted, they are not 90% but 35% and 40%

 I like to look at my collections' total silver amount verses value sometimes

The ounces went down without the number of coins going down in my collection

It made me curious as to what could have caused it and that's what I found 

Not sure if it happened to other coins in other countries at this time

They still have a bullion value based on silver on the pages, it just isn't counting as total silver ounces in my collection

Is this a bug ?

Several years ago coins with less than .500 silver were reclassified as billon. However, as long as the percentage of silver in the coin is still added to the composition the silver weight and value are correctly determined.  Both the coins you mentioned still contribute to the silver weight and value in your collection. To illustrate I created a new collection and added 100 .350 silver (1.75 g/coin) war nickels. Here's the My collection page:

Then I deleted the nickels and added 100 .400 silver (4.60 g/coin) half dollars:

Both accurately determined the silver weight and value. There is no bug.

Not sure what you are saying is what happened, you show that those coins still count as total silver weight in a collection

I'm seeing that they don't in mine and it recently happened within a few weeks, sorry to disagree. I will do a test of my own with deleting some of those Billion coins to see if it affects the total silver weight 

Ok, I did a test, you are correct, they do count, so to me there is something else that happened and I will continue to look

Thank you! 

Hi, there was something causing what I saw, it was in Exonumia , I increased the number of silver bars I have on one bar in my collection to 10 more than what I have.

As soon as I did that my collection had 10 ounces more than what I should have, I reversed it to be correct.

Bug or not, it was odd that it was not counting them, it is correct now

I find a lot of coins with sub 50% silver, they do not put a bullion value on - which is unfortunate as many older coins had weird fractions of silver (A thread on CCF a few years ago had members posting coins from 70% silver down to 1% silver and they managed to fill nearly every percentile down to weird Polish pennies that were like 1% silver and various renaissance German state coins that were like 27.13% silver and 9.09% etc).

For me, its mainly a lot of Ottoman Turkish coins of the 1770s like 2 Zolotas and Besliks that were like 46 or 47% silver but called Billon. Also many Swedish coins were penalised as they were 40% silver from 1920 to 1967.