Unwanted Chinese & Greek Characters

[Andy]

Hi;

My query is returning Chinese and Greek characters. The error message is
"Data type mismatch in criteria expression".

The query is based on 2 other querries, (the first pulls from the Main
table, (Customer), the second from a Sub table, (ProductsBought).

I've created 3 expressions, (nothing in the Criteria row).

Exp1: IIf([qryProdBuyTbl]![ProdBuyCatagoryName]="Clothing" And
[qryProdBuyTbl]![ProdBuySubCategoryName]="Shirts",[qryProdBuyTbl]![ProdUnits
Bought]*[qryProdBuyTbl]![ProdBuyUnitPrice]," ")

Exp2: IIf([qryProdBuyTbl]![ProdBuyCatagoryName]="Clothing" And
[qryProdBuyTbl]![ProdBuySubCategoryName]="Pants",[qryProdBuyTbl]![ProdUnitsB
ought]*[qryProdBuyTbl]![ProdBuyUnitPrice]," ")

Exp3: IIf([qryProdBuyTbl]![ProdBuyCatagoryName]="Clothing" And
[qryProdBuyTbl]![ProdBuySubCategoryName]="Shoes",[qryProdBuyTbl]![ProdUnitsB
ought]*[qryProdBuyTbl]![ProdBuyUnitPrice]," ")

If only 1 item is selected the answer is displayed correctly. If 2 or more
items are selected the mismatch occurs.

Have discovered the following things:

Changing the arguments to ,"Yes","No") returns a correct answer.

Occasionally deleting 2 of the expressions, (doesn't matter which 2), will
display a square and a lower case r.

When copied and pasted into MSWord the font for the square is Chinese, (at
72 points it is an artistic Chinese character) and the R is Greek.

When I highlight either character and try to change to a different font; if
the font has the ability to display Chinese or Greek the font name changes;
if not, the font name remains the same.

When the expressions are placed in the qryProdBuyTbl, (pulls only from the
Sub table), they work perfectly.

Anyone have any suggestions?

Thank you.

Andy